[mirror_ubuntu-artful-kernel.git] / drivers / extcon / extcon-palmas.c

/*
 * Palmas USB transceiver driver
 *
 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Author: Graeme Gregory <gg@slimlogic.co.uk>
 * Author: Kishon Vijay Abraham I <kishon@ti.com>
 *
 * Based on twl6030_usb.c
 *
 * Author: Hema HK <hemahk@ti.com>
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/mfd/palmas.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/workqueue.h>

#define USB_GPIO_DEBOUNCE_MS	20	/* ms */

static const unsigned int palmas_extcon_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,
	EXTCON_NONE,
};

static void palmas_usb_wakeup(struct palmas *palmas, int enable)
{
	if (enable)
		palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
			PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
	else
		palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
}

static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
{
	struct palmas_usb *palmas_usb = _palmas_usb;
	struct extcon_dev *edev = palmas_usb->edev;
	unsigned int vbus_line_state;

	palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
		PALMAS_INT3_LINE_STATE, &vbus_line_state);

	if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
		if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
			palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
			extcon_set_state_sync(edev, EXTCON_USB, true);
			dev_dbg(palmas_usb->dev, "USB cable is attached\n");
		} else {
			dev_dbg(palmas_usb->dev,
				"Spurious connect event detected\n");
		}
	} else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
		if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
			palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
			extcon_set_state_sync(edev, EXTCON_USB, false);
			dev_dbg(palmas_usb->dev, "USB cable is detached\n");
		} else {
			dev_dbg(palmas_usb->dev,
				"Spurious disconnect event detected\n");
		}
	}

	return IRQ_HANDLED;
}

static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
{
	unsigned int set, id_src;
	struct palmas_usb *palmas_usb = _palmas_usb;
	struct extcon_dev *edev = palmas_usb->edev;

	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
		PALMAS_USB_ID_INT_LATCH_SET, &set);
	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
		PALMAS_USB_ID_INT_SRC, &id_src);

	if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
				(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
			PALMAS_USB_ID_INT_LATCH_CLR,
			PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
		palmas_usb->linkstat = PALMAS_USB_STATE_ID;
		extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
	} else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
				(id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
			PALMAS_USB_ID_INT_LATCH_CLR,
			PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
		palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
		extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
				(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
		palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
		extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
				(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
		palmas_usb->linkstat = PALMAS_USB_STATE_ID;
		extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
		dev_dbg(palmas_usb->dev, " USB-HOST cable is attached\n");
	}

	return IRQ_HANDLED;
}

static void palmas_gpio_id_detect(struct work_struct *work)
{
	int id;
	struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
						     struct palmas_usb,
						     wq_detectid);
	struct extcon_dev *edev = palmas_usb->edev;

	if (!palmas_usb->id_gpiod)
		return;

	id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);

	if (id) {
		extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
	} else {
		extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
	}
}

static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
{
	struct palmas_usb *palmas_usb = _palmas_usb;

	queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
			   palmas_usb->sw_debounce_jiffies);

	return IRQ_HANDLED;
}

static void palmas_enable_irq(struct palmas_usb *palmas_usb)
{
	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
		PALMAS_USB_VBUS_CTRL_SET,
		PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);

	if (palmas_usb->enable_id_detection) {
		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
			     PALMAS_USB_ID_CTRL_SET,
			     PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);

		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
			     PALMAS_USB_ID_INT_EN_HI_SET,
			     PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
			     PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
	}

	if (palmas_usb->enable_vbus_detection)
		palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);

	/* cold plug for host mode needs this delay */
	if (palmas_usb->enable_id_detection) {
		msleep(30);
		palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
	}
}

static int palmas_usb_probe(struct platform_device *pdev)
{
	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	struct palmas_usb_platform_data	*pdata = dev_get_platdata(&pdev->dev);
	struct device_node *node = pdev->dev.of_node;
	struct palmas_usb *palmas_usb;
	int status;

	if (!palmas) {
		dev_err(&pdev->dev, "failed to get valid parent\n");
		return -EINVAL;
	}

	palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
	if (!palmas_usb)
		return -ENOMEM;

	if (node && !pdata) {
		palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
		palmas_usb->enable_id_detection = of_property_read_bool(node,
						"ti,enable-id-detection");
		palmas_usb->enable_vbus_detection = of_property_read_bool(node,
						"ti,enable-vbus-detection");
	} else {
		palmas_usb->wakeup = true;
		palmas_usb->enable_id_detection = true;
		palmas_usb->enable_vbus_detection = true;

		if (pdata)
			palmas_usb->wakeup = pdata->wakeup;
	}

	palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
							GPIOD_IN);
	if (IS_ERR(palmas_usb->id_gpiod)) {
		dev_err(&pdev->dev, "failed to get id gpio\n");
		return PTR_ERR(palmas_usb->id_gpiod);
	}

	palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
							GPIOD_IN);
	if (IS_ERR(palmas_usb->vbus_gpiod)) {
		dev_err(&pdev->dev, "failed to get vbus gpio\n");
		return PTR_ERR(palmas_usb->vbus_gpiod);
	}

	if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
		palmas_usb->enable_id_detection = false;
		palmas_usb->enable_gpio_id_detection = true;
	}

	if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
		palmas_usb->enable_vbus_detection = false;
		palmas_usb->enable_gpio_vbus_detection = true;
	}

	if (palmas_usb->enable_gpio_id_detection) {
		u32 debounce;

		if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
			debounce = USB_GPIO_DEBOUNCE_MS;

		status = gpiod_set_debounce(palmas_usb->id_gpiod,
					    debounce * 1000);
		if (status < 0)
			palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
	}

	INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);

	palmas->usb = palmas_usb;
	palmas_usb->palmas = palmas;

	palmas_usb->dev	 = &pdev->dev;

	palmas_usb_wakeup(palmas, palmas_usb->wakeup);

	platform_set_drvdata(pdev, palmas_usb);

	palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
						    palmas_extcon_cable);
	if (IS_ERR(palmas_usb->edev)) {
		dev_err(&pdev->dev, "failed to allocate extcon device\n");
		return -ENOMEM;
	}

	status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
	if (status) {
		dev_err(&pdev->dev, "failed to register extcon device\n");
		return status;
	}

	if (palmas_usb->enable_id_detection) {
		palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
							     PALMAS_ID_OTG_IRQ);
		palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
							 PALMAS_ID_IRQ);
		status = devm_request_threaded_irq(palmas_usb->dev,
				palmas_usb->id_irq,
				NULL, palmas_id_irq_handler,
				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
				IRQF_ONESHOT,
				"palmas_usb_id", palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
					palmas_usb->id_irq, status);
			return status;
		}
	} else if (palmas_usb->enable_gpio_id_detection) {
		palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
		if (palmas_usb->gpio_id_irq < 0) {
			dev_err(&pdev->dev, "failed to get id irq\n");
			return palmas_usb->gpio_id_irq;
		}
		status = devm_request_threaded_irq(&pdev->dev,
						   palmas_usb->gpio_id_irq,
						   NULL,
						   palmas_gpio_id_irq_handler,
						   IRQF_TRIGGER_RISING |
						   IRQF_TRIGGER_FALLING |
						   IRQF_ONESHOT,
						   "palmas_usb_id",
						   palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev,
				"failed to request handler for id irq\n");
			return status;
		}
	}

	if (palmas_usb->enable_vbus_detection) {
		palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
						       PALMAS_VBUS_OTG_IRQ);
		palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
							   PALMAS_VBUS_IRQ);
		status = devm_request_threaded_irq(palmas_usb->dev,
				palmas_usb->vbus_irq, NULL,
				palmas_vbus_irq_handler,
				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
				IRQF_ONESHOT,
				"palmas_usb_vbus", palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
					palmas_usb->vbus_irq, status);
			return status;
		}
	} else if (palmas_usb->enable_gpio_vbus_detection) {
		/* remux GPIO_1 as VBUSDET */
		status = palmas_update_bits(palmas,
			PALMAS_PU_PD_OD_BASE,
			PALMAS_PRIMARY_SECONDARY_PAD1,
			PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
			(1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
		if (status < 0) {
			dev_err(&pdev->dev, "can't remux GPIO1\n");
			return status;
		}

		palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
						       PALMAS_VBUS_OTG_IRQ);
		palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
		if (palmas_usb->gpio_vbus_irq < 0) {
			dev_err(&pdev->dev, "failed to get vbus irq\n");
			return palmas_usb->gpio_vbus_irq;
		}
		status = devm_request_threaded_irq(&pdev->dev,
						palmas_usb->gpio_vbus_irq,
						NULL,
						palmas_vbus_irq_handler,
						IRQF_TRIGGER_FALLING |
						IRQF_TRIGGER_RISING |
						IRQF_ONESHOT,
						"palmas_usb_vbus",
						palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev,
				"failed to request handler for vbus irq\n");
			return status;
		}
	}

	palmas_enable_irq(palmas_usb);
	/* perform initial detection */
	if (palmas_usb->enable_gpio_vbus_detection)
		palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
	device_set_wakeup_capable(&pdev->dev, true);
	return 0;
}

static int palmas_usb_remove(struct platform_device *pdev)
{
	struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);

	cancel_delayed_work_sync(&palmas_usb->wq_detectid);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int palmas_usb_suspend(struct device *dev)
{
	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);

	if (device_may_wakeup(dev)) {
		if (palmas_usb->enable_vbus_detection)
			enable_irq_wake(palmas_usb->vbus_irq);
		if (palmas_usb->enable_gpio_vbus_detection)
			enable_irq_wake(palmas_usb->gpio_vbus_irq);
		if (palmas_usb->enable_id_detection)
			enable_irq_wake(palmas_usb->id_irq);
		if (palmas_usb->enable_gpio_id_detection)
			enable_irq_wake(palmas_usb->gpio_id_irq);
	}
	return 0;
}

static int palmas_usb_resume(struct device *dev)
{
	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);

	if (device_may_wakeup(dev)) {
		if (palmas_usb->enable_vbus_detection)
			disable_irq_wake(palmas_usb->vbus_irq);
		if (palmas_usb->enable_gpio_vbus_detection)
			disable_irq_wake(palmas_usb->gpio_vbus_irq);
		if (palmas_usb->enable_id_detection)
			disable_irq_wake(palmas_usb->id_irq);
		if (palmas_usb->enable_gpio_id_detection)
			disable_irq_wake(palmas_usb->gpio_id_irq);
	}

	/* check if GPIO states changed while suspend/resume */
	if (palmas_usb->enable_gpio_vbus_detection)
		palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);

	return 0;
};
#endif

static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);

static const struct of_device_id of_palmas_match_tbl[] = {
	{ .compatible = "ti,palmas-usb", },
	{ .compatible = "ti,palmas-usb-vid", },
	{ .compatible = "ti,twl6035-usb", },
	{ .compatible = "ti,twl6035-usb-vid", },
	{ /* end */ }
};

static struct platform_driver palmas_usb_driver = {
	.probe = palmas_usb_probe,
	.remove = palmas_usb_remove,
	.driver = {
		.name = "palmas-usb",
		.of_match_table = of_palmas_match_tbl,
		.pm = &palmas_pm_ops,
	},
};

module_platform_driver(palmas_usb_driver);

MODULE_ALIAS("platform:palmas-usb");
MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
MODULE_DESCRIPTION("Palmas USB transceiver driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
Commit	Line	Data
b1f254e3 GG	1	/*
	2	* Palmas USB transceiver driver
	3	*
	4	* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* Author: Graeme Gregory <gg@slimlogic.co.uk>
	11	* Author: Kishon Vijay Abraham I <kishon@ti.com>
	12	*
	13	* Based on twl6030_usb.c
	14	*
	15	* Author: Hema HK <hemahk@ti.com>
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/platform_device.h>
f63d32d4	26	#include <linux/slab.h>
b1f254e3 GG	27	#include <linux/err.h>
	28	#include <linux/mfd/palmas.h>
	29	#include <linux/of.h>
	30	#include <linux/of_platform.h>
92b7cb5d	31	#include <linux/of_gpio.h>
ac22a1d3	32	#include <linux/gpio/consumer.h>
92b7cb5d RQ	33	#include <linux/workqueue.h>
	34
	35	#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
b1f254e3	36
73b6ecdb	37	static const unsigned int palmas_extcon_cable[] = {
2a9de9c0 CC	38	EXTCON_USB,
	39	EXTCON_USB_HOST,
	40	EXTCON_NONE,
b1f254e3 GG	41	};
b1f254e3 GG	42
b1f254e3 GG	43	static void palmas_usb_wakeup(struct palmas *palmas, int enable)
	44	{
	45	if (enable)
	46	palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
	47	PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
	48	else
	49	palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
	50	}
	51
	52	static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
	53	{
	54	struct palmas_usb *palmas_usb = _palmas_usb;
2a9de9c0	55	struct extcon_dev *edev = palmas_usb->edev;
b1f254e3 GG	56	unsigned int vbus_line_state;
	57
	58	palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
	59	PALMAS_INT3_LINE_STATE, &vbus_line_state);
	60
	61	if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
	62	if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
	63	palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
8670b459	64	extcon_set_state_sync(edev, EXTCON_USB, true);
567ab5a8	65	dev_dbg(palmas_usb->dev, "USB cable is attached\n");
b1f254e3 GG	66	} else {
	67	dev_dbg(palmas_usb->dev,
	68	"Spurious connect event detected\n");
	69	}
	70	} else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
	71	if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
	72	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
8670b459	73	extcon_set_state_sync(edev, EXTCON_USB, false);
567ab5a8	74	dev_dbg(palmas_usb->dev, "USB cable is detached\n");
b1f254e3 GG	75	} else {
	76	dev_dbg(palmas_usb->dev,
	77	"Spurious disconnect event detected\n");
	78	}
	79	}
	80
	81	return IRQ_HANDLED;
	82	}
	83
	84	static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
	85	{
b7d2d5be	86	unsigned int set, id_src;
b1f254e3	87	struct palmas_usb *palmas_usb = _palmas_usb;
2a9de9c0	88	struct extcon_dev *edev = palmas_usb->edev;
b1f254e3 GG	89
	90	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	91	PALMAS_USB_ID_INT_LATCH_SET, &set);
b7d2d5be GC	92	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
b7d2d5be GC	93	PALMAS_USB_ID_INT_SRC, &id_src);
b1f254e3	94
b7d2d5be GC	95	if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
b7d2d5be GC	96	(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
b1f254e3 GG	97	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	98	PALMAS_USB_ID_INT_LATCH_CLR,
	99	PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
	100	palmas_usb->linkstat = PALMAS_USB_STATE_ID;
8670b459	101	extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
567ab5a8	102	dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
b7d2d5be GC	103	} else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
b7d2d5be GC	104	(id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
b1f254e3 GG	105	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	106	PALMAS_USB_ID_INT_LATCH_CLR,
	107	PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
	108	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
8670b459	109	extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
567ab5a8	110	dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
002945f0 LD	111	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
	112	(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
	113	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
8670b459	114	extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
567ab5a8	115	dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
b7d2d5be GC	116	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
	117	(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
	118	palmas_usb->linkstat = PALMAS_USB_STATE_ID;
8670b459	119	extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
567ab5a8	120	dev_dbg(palmas_usb->dev, " USB-HOST cable is attached\n");
b1f254e3 GG	121	}
	122
	123	return IRQ_HANDLED;
	124	}
	125
92b7cb5d RQ	126	static void palmas_gpio_id_detect(struct work_struct *work)
	127	{
	128	int id;
	129	struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
	130	struct palmas_usb,
	131	wq_detectid);
	132	struct extcon_dev *edev = palmas_usb->edev;
	133
	134	if (!palmas_usb->id_gpiod)
	135	return;
	136
	137	id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
	138
	139	if (id) {
8670b459	140	extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
567ab5a8	141	dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
92b7cb5d	142	} else {
8670b459	143	extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
567ab5a8	144	dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
92b7cb5d RQ	145	}
	146	}
	147
	148	static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
	149	{
	150	struct palmas_usb *palmas_usb = _palmas_usb;
	151
	152	queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
	153	palmas_usb->sw_debounce_jiffies);
	154
	155	return IRQ_HANDLED;
	156	}
	157
b1f254e3 GG	158	static void palmas_enable_irq(struct palmas_usb *palmas_usb)
	159	{
	160	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	161	PALMAS_USB_VBUS_CTRL_SET,
	162	PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
	163
92b7cb5d RQ	164	if (palmas_usb->enable_id_detection) {
	165	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	166	PALMAS_USB_ID_CTRL_SET,
	167	PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
b1f254e3	168
92b7cb5d RQ	169	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	170	PALMAS_USB_ID_INT_EN_HI_SET,
	171	PALMAS_USB_ID_INT_EN_HI_SET_ID_GND \|
	172	PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
	173	}
b1f254e3	174
7281e05a LD	175	if (palmas_usb->enable_vbus_detection)
7281e05a LD	176	palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
b1f254e3 GG	177
b1f254e3 GG	178	/* cold plug for host mode needs this delay */
7281e05a LD	179	if (palmas_usb->enable_id_detection) {
	180	msleep(30);
	181	palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
	182	}
b1f254e3 GG	183	}
	184
	185	static int palmas_usb_probe(struct platform_device *pdev)
	186	{
	187	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
7c0f6558	188	struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
b1f254e3 GG	189	struct device_node *node = pdev->dev.of_node;
	190	struct palmas_usb *palmas_usb;
	191	int status;
	192
9fe172b9 RQ	193	if (!palmas) {
	194	dev_err(&pdev->dev, "failed to get valid parent\n");
	195	return -EINVAL;
	196	}
	197
b1f254e3 GG	198	palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
	199	if (!palmas_usb)
	200	return -ENOMEM;
	201
7281e05a LD	202	if (node && !pdata) {
	203	palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
	204	palmas_usb->enable_id_detection = of_property_read_bool(node,
	205	"ti,enable-id-detection");
	206	palmas_usb->enable_vbus_detection = of_property_read_bool(node,
	207	"ti,enable-vbus-detection");
	208	} else {
	209	palmas_usb->wakeup = true;
	210	palmas_usb->enable_id_detection = true;
	211	palmas_usb->enable_vbus_detection = true;
	212
	213	if (pdata)
	214	palmas_usb->wakeup = pdata->wakeup;
	215	}
	216
ac22a1d3 CC	217	palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
ac22a1d3 CC	218	GPIOD_IN);
92b7cb5d RQ	219	if (IS_ERR(palmas_usb->id_gpiod)) {
	220	dev_err(&pdev->dev, "failed to get id gpio\n");
	221	return PTR_ERR(palmas_usb->id_gpiod);
	222	}
	223
b7aad8e2 FB	224	palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
	225	GPIOD_IN);
	226	if (IS_ERR(palmas_usb->vbus_gpiod)) {
	227	dev_err(&pdev->dev, "failed to get vbus gpio\n");
	228	return PTR_ERR(palmas_usb->vbus_gpiod);
	229	}
	230
92b7cb5d RQ	231	if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
	232	palmas_usb->enable_id_detection = false;
	233	palmas_usb->enable_gpio_id_detection = true;
	234	}
	235
b7aad8e2 FB	236	if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
	237	palmas_usb->enable_vbus_detection = false;
	238	palmas_usb->enable_gpio_vbus_detection = true;
	239	}
	240
92b7cb5d RQ	241	if (palmas_usb->enable_gpio_id_detection) {
	242	u32 debounce;
	243
	244	if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
	245	debounce = USB_GPIO_DEBOUNCE_MS;
	246
	247	status = gpiod_set_debounce(palmas_usb->id_gpiod,
	248	debounce * 1000);
	249	if (status < 0)
	250	palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
	251	}
	252
	253	INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
	254
b1f254e3 GG	255	palmas->usb = palmas_usb;
	256	palmas_usb->palmas = palmas;
	257
	258	palmas_usb->dev = &pdev->dev;
	259
7281e05a	260	palmas_usb_wakeup(palmas, palmas_usb->wakeup);
b1f254e3 GG	261
	262	platform_set_drvdata(pdev, palmas_usb);
	263
3f79a3fb CC	264	palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
	265	palmas_extcon_cable);
	266	if (IS_ERR(palmas_usb->edev)) {
	267	dev_err(&pdev->dev, "failed to allocate extcon device\n");
	268	return -ENOMEM;
	269	}
b1f254e3	270
3f79a3fb	271	status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
b1f254e3 GG	272	if (status) {
	273	dev_err(&pdev->dev, "failed to register extcon device\n");
	274	return status;
	275	}
	276
7281e05a	277	if (palmas_usb->enable_id_detection) {
92b7cb5d RQ	278	palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	279	PALMAS_ID_OTG_IRQ);
	280	palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
	281	PALMAS_ID_IRQ);
7281e05a LD	282	status = devm_request_threaded_irq(palmas_usb->dev,
	283	palmas_usb->id_irq,
	284	NULL, palmas_id_irq_handler,
	285	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
ae64e42c	286	IRQF_ONESHOT,
7281e05a LD	287	"palmas_usb_id", palmas_usb);
	288	if (status < 0) {
	289	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
b1f254e3	290	palmas_usb->id_irq, status);
b4dad55a	291	return status;
7281e05a	292	}
92b7cb5d RQ	293	} else if (palmas_usb->enable_gpio_id_detection) {
	294	palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
	295	if (palmas_usb->gpio_id_irq < 0) {
	296	dev_err(&pdev->dev, "failed to get id irq\n");
	297	return palmas_usb->gpio_id_irq;
	298	}
	299	status = devm_request_threaded_irq(&pdev->dev,
	300	palmas_usb->gpio_id_irq,
	301	NULL,
	302	palmas_gpio_id_irq_handler,
	303	IRQF_TRIGGER_RISING \|
	304	IRQF_TRIGGER_FALLING \|
	305	IRQF_ONESHOT,
	306	"palmas_usb_id",
	307	palmas_usb);
	308	if (status < 0) {
	309	dev_err(&pdev->dev,
	310	"failed to request handler for id irq\n");
	311	return status;
	312	}
b1f254e3 GG	313	}
b1f254e3 GG	314
7281e05a	315	if (palmas_usb->enable_vbus_detection) {
92b7cb5d RQ	316	palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	317	PALMAS_VBUS_OTG_IRQ);
	318	palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
	319	PALMAS_VBUS_IRQ);
7281e05a LD	320	status = devm_request_threaded_irq(palmas_usb->dev,
	321	palmas_usb->vbus_irq, NULL,
	322	palmas_vbus_irq_handler,
	323	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
ae64e42c	324	IRQF_ONESHOT,
7281e05a LD	325	"palmas_usb_vbus", palmas_usb);
	326	if (status < 0) {
	327	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
b1f254e3	328	palmas_usb->vbus_irq, status);
b4dad55a	329	return status;
7281e05a	330	}
b7aad8e2 FB	331	} else if (palmas_usb->enable_gpio_vbus_detection) {
	332	/* remux GPIO_1 as VBUSDET */
	333	status = palmas_update_bits(palmas,
	334	PALMAS_PU_PD_OD_BASE,
	335	PALMAS_PRIMARY_SECONDARY_PAD1,
	336	PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
	337	(1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
	338	if (status < 0) {
	339	dev_err(&pdev->dev, "can't remux GPIO1\n");
	340	return status;
	341	}
	342
	343	palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	344	PALMAS_VBUS_OTG_IRQ);
	345	palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
	346	if (palmas_usb->gpio_vbus_irq < 0) {
	347	dev_err(&pdev->dev, "failed to get vbus irq\n");
	348	return palmas_usb->gpio_vbus_irq;
	349	}
	350	status = devm_request_threaded_irq(&pdev->dev,
	351	palmas_usb->gpio_vbus_irq,
	352	NULL,
	353	palmas_vbus_irq_handler,
	354	IRQF_TRIGGER_FALLING \|
	355	IRQF_TRIGGER_RISING \|
f75587b8	356	IRQF_ONESHOT,
b7aad8e2 FB	357	"palmas_usb_vbus",
	358	palmas_usb);
	359	if (status < 0) {
	360	dev_err(&pdev->dev,
	361	"failed to request handler for vbus irq\n");
	362	return status;
	363	}
b1f254e3 GG	364	}
	365
	366	palmas_enable_irq(palmas_usb);
92b7cb5d	367	/* perform initial detection */
62e6d1e5 RQ	368	if (palmas_usb->enable_gpio_vbus_detection)
62e6d1e5 RQ	369	palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
92b7cb5d	370	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
024783ef	371	device_set_wakeup_capable(&pdev->dev, true);
b1f254e3	372	return 0;
b1f254e3 GG	373	}
b1f254e3 GG	374
92b7cb5d RQ	375	static int palmas_usb_remove(struct platform_device *pdev)
	376	{
	377	struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
	378
	379	cancel_delayed_work_sync(&palmas_usb->wq_detectid);
	380
	381	return 0;
	382	}
	383
024783ef LD	384	#ifdef CONFIG_PM_SLEEP
	385	static int palmas_usb_suspend(struct device *dev)
	386	{
	387	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
	388
	389	if (device_may_wakeup(dev)) {
7281e05a LD	390	if (palmas_usb->enable_vbus_detection)
7281e05a LD	391	enable_irq_wake(palmas_usb->vbus_irq);
b7aad8e2 FB	392	if (palmas_usb->enable_gpio_vbus_detection)
b7aad8e2 FB	393	enable_irq_wake(palmas_usb->gpio_vbus_irq);
7281e05a LD	394	if (palmas_usb->enable_id_detection)
7281e05a LD	395	enable_irq_wake(palmas_usb->id_irq);
92b7cb5d RQ	396	if (palmas_usb->enable_gpio_id_detection)
92b7cb5d RQ	397	enable_irq_wake(palmas_usb->gpio_id_irq);
024783ef LD	398	}
	399	return 0;
	400	}
	401
	402	static int palmas_usb_resume(struct device *dev)
	403	{
	404	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
	405
	406	if (device_may_wakeup(dev)) {
7281e05a LD	407	if (palmas_usb->enable_vbus_detection)
7281e05a LD	408	disable_irq_wake(palmas_usb->vbus_irq);
b7aad8e2 FB	409	if (palmas_usb->enable_gpio_vbus_detection)
b7aad8e2 FB	410	disable_irq_wake(palmas_usb->gpio_vbus_irq);
7281e05a LD	411	if (palmas_usb->enable_id_detection)
7281e05a LD	412	disable_irq_wake(palmas_usb->id_irq);
92b7cb5d RQ	413	if (palmas_usb->enable_gpio_id_detection)
92b7cb5d RQ	414	disable_irq_wake(palmas_usb->gpio_id_irq);
024783ef	415	}
01944321 RQ	416
	417	/* check if GPIO states changed while suspend/resume */
	418	if (palmas_usb->enable_gpio_vbus_detection)
	419	palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
	420	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
	421
024783ef LD	422	return 0;
	423	};
	424	#endif
	425
8d4288fb	426	static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
024783ef	427
3bc2ac7d	428	static const struct of_device_id of_palmas_match_tbl[] = {
b1f254e3	429	{ .compatible = "ti,palmas-usb", },
5fbc77d6	430	{ .compatible = "ti,palmas-usb-vid", },
b1f254e3	431	{ .compatible = "ti,twl6035-usb", },
5fbc77d6	432	{ .compatible = "ti,twl6035-usb-vid", },
b1f254e3 GG	433	{ /* end */ }
	434	};
	435
	436	static struct platform_driver palmas_usb_driver = {
	437	.probe = palmas_usb_probe,
92b7cb5d	438	.remove = palmas_usb_remove,
b1f254e3 GG	439	.driver = {
	440	.name = "palmas-usb",
	441	.of_match_table = of_palmas_match_tbl,
024783ef	442	.pm = &palmas_pm_ops,
b1f254e3 GG	443	},
	444	};
	445
	446	module_platform_driver(palmas_usb_driver);
	447
	448	MODULE_ALIAS("platform:palmas-usb");
	449	MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
	450	MODULE_DESCRIPTION("Palmas USB transceiver driver");
	451	MODULE_LICENSE("GPL");
	452	MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);